The document describes a disturbing personal experience the author had after watching a mysterious YouTube video from the user nana825763 late one night at an empty cyber cafe. After watching the video, strange events began occurring including flickering lights, falling objects, broken windows, and discovering the owner's son violently ill and later dead with a cracked skull, though without blood. The author fled in fear but continues having nightmares, and it was later found that the owner had committed suicide.